1st Gen R53 Cooper S Most liked posts in thread: Cooper S Max coolant Presure

  1. MCS02

    MCS02 Moderator
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    #2 MCS02, Aug 11, 2013
    Maybe check your radiator cap.
     
  2. Xpress Motors

    Xpress Motors New Member

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    #3 Xpress Motors, Aug 11, 2013
    pressure

    Radiator cap ok. cap venting at extreme presure.
     
  3. Dave.0

    Dave.0 Helix & RMW Powered
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    #4 Dave.0, Aug 11, 2013
    Could be the sign of the water pump or T-stat on its way out.
     
  4. Nathan

    Nathan Founder

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    #5 Nathan, Aug 11, 2013
    I would not trust the gauge, it only shows, cold, normalish and overheating. I'd connect something that gives you an actual temp read out to see if it getting to hot or not.

    Possible causes are a thermostat not fully opening. When was the last time that was checked or changed. Has the cooling system been flushed recently, there could be a blockage from something being dislodged.
     
  5. minsanity

    minsanity Well-Known Member

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    #6 minsanity, Aug 11, 2013
    +1 on the above. Or the cooling fan is cooked. Stock cap is just rated 16psi. Normal operating temps & pressures seldom vent thru the cap.
     
  6. Xpress Motors

    Xpress Motors New Member

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    #7 Xpress Motors, Aug 20, 2013
    gasket

    Thanks for your replies in the process of changing the head gasket and thermostat will up date you later. :arf: